The Republican nominating race is a mess: a strong field, but with ten declared candidates and a half-dozen more to come, we need a bouncer to keep order. I’ve given myself the job. Rope lines separate the four categories. A. Top tier: 1. Jeb Bush. Solid, no sizzle. Sizzle may be in less demand than eight years ago, but his inability to separate from the pack, his recent campaign shakeup and his four-day stumble over Megyn Kelly’s “knowing what we know now” Iraq question have given even his supporters pause. Nonetheless, a bulging war chest, a fine gubernatorial record, and...